Merge pull request #1796 from cesanta/rpicow

Dettach git clone and fix clean

examples/raspberry/raspberry-pi-pico-w/Makefile

@@ -1,9 +1,12 @@
 NAME = raspberry-pi-pico-w
 
-build:
+$(NAME):
 	git clone --depth 1 https://github.com/mongoose-examples/$(NAME)
+
+build: | $(NAME)
 	cp ./../../../mongoose.[ch] $(NAME)
 	make -C $(NAME) build
 
 clean:
+	make -C $(NAME) clean
 	rm -rf $(NAME)